1R, Cis 2,2-dihalovinyl-3,3-dimethylcyclopropylmethanol and ester derivatives

Abstract

Preparation of novel alkyl 2,2-dihalovinylcyclopropylacetates (intermediates in the preparation of insecticides) by reaction of a phosphine with a compound generating a dihalocarbene and reaction of the product resulting therefrom with an alkyl formylcyclopropylacetate, both reactions being carried out in a solvent.

What we claim is: 
     
       1. A (1R,cis) compound of the formula: ##STR11## wherein R is an alkyl group containing from 1 to 4 carbon atoms and Hal 2  is two halogen atoms having an atomic number from 9 to 35. 
     
     
       2. A compound according to claim 1 in which R represents a methyl group. 
     
     
       3. A compound according to claim 2 in which Hal 2  is two chlorine atoms. 
     
     
       4. A (1R,cis) 2-(2,2-dihalovinyl)-3,3-dimethylcyclopropylmethanol wherein each halo represents a halogen atom having an atomic number of from 9 to 35, inclusive. 
     
     
       5. A compound according to claim 4 wherein each halo is chloro.